“For 25 of those years, Landsat 7’s data helped farmers, land managers, city planners, and scientists, as well as communities around the world better understand and manage land, water, and other natural resources.”
Landsat 7 launched in 1999 and returned data for 25 years. It will drift dead in orbit for about 55 years before it reenters. Landsat 8 and 9 carry on, and the next one is not planned until the early 2030s. The archive stays public and free at the USGS EROS Center.